Can you clarify what you mean? C6g, M6g, and R6g instances have been available for a while now, and those support many different workloads. M6g is the "general purpose" variant. https://aws.amazon.com/ec2/instance-types/m6/
https://aws.amazon.com/blogs/containers/eks-on-graviton-gene...
Well I for long thought that taping out own CPU chips, even on Amazon's scale, wasn't that cheap.
The time of Intel demanding obscene prices for high core count server CPUs is at least 2 years since passed.
I was thinking if it still makes sense economically for Amazon to continue developing, and buying their own CPUs given that.
While Intel dont disclose their CPU segment of their DC, you can bet it is the vast majority. Which gives you a rough idea of the scale of Amazon spending, i.e around 20% of Intel DC revenue.
And once you see those numbers, even if it is off by 30% or even double counted. Developing cost of CPU, especially when it is more of "working" together with ARM on developing Graviton 2 ( which it in itself extremely similar to ARM's reference design ) doesn't seems to be expensive or out of question.